On a cold Halloween night in 1963, in the small town of Haddonfield, Illinois, a six-year-old boy named Michael Myers inexplicably stabs his sister to death in their family home. Convicted and sent to a mental institution, he becomes the patient of Dr. Sam Loomis. Fifteen years later, on the eve of Halloween, Michael escapes from the institution. Driven by inscrutable motives, he returns to Haddonfield, with Dr. Loomis in pursuit, intent on preventing Michael from committing any more atrocities. The town, oblivious to the impending danger, prepares for its Halloween celebrations as Michael quietly stalks the residential streets.

Among the local residents is Laurie Strode, a high school student who spends her time babysitting and navigating teenage life. As the day turns into night, Laurie and her friends become the focus of Michael's menacing attention. Unbeknownst to them, he watches from the shadows, his presence signaled only by his heavy breathing and the fleeting glimpse of a masked figure. When friends begin to experience unsettling occurrences, Laurie senses that something is terribly amiss. The evening descends into a harrowing sequence of events as the true horror of Michael Myers' return to Haddonfield unfolds. Dr. Loomis desperately tries to track down his former patient, but whether he can arrive in time to stop Michael's silent rampage remains uncertain.